JPS63287629A - Large motion suppressing device for power unit - Google Patents

Abstract

PURPOSE:To prevent an engine from transmitting its vibration to a car body side, by connecting one of the inner rod and the outer cylinder to a power unit side and the other to the car body side and enabling both the rod and the cylinder to relatively move mutually in the axial direction. CONSTITUTION:An outer cylinder internally mounts a solenoid 5 to annular space 9a, and a cylinder part 9 forms a connecting rod part 10 protrusively extending. An inner cylinder member 13 is inserted through an elastic member 12 into a cylinder member 11 fixedly provided in the connecting rod part 10, and the outer cylinder is connected to a car body 2 by turnably supporting the inner cylinder member 13 to a supporting shaft 2b. An inner rod 6 provides a ferromagnetic material part 7 in the point end, while the inner rod 6 is supported penetrating slidably in the axial direction through the cylinder part 9 of the outer cylinder 4 through a pair of bearings 14 mounted to both sides of the ferromagnetic material part 7. The inner rod 6 is connected to a power unit 1 by supporting a cylinder member 15 rotatably to a supporting shaft 1b.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an improvement in a device for suppressing large-scale behavior of a power unit. [Prior art and its problems]

An automobile engine, or a power unit in which the engine and a transmission are integrated, is supported by a rigid member in an engine room via an engine mount device having a vibration-insulating function. For example, the power unit of a horizontally-mounted FF vehicle is generally supported by the vehicle body via mounting devices at four locations: three locations in the front and rear of the lower portion, and two locations on the left and right approximately along the main axis of roll inertia. By the way, especially in the case of a horizontally mounted FF type power unit as described above, during sudden acceleration or sudden deceleration due to engine braking, the power unit receives a large reaction force from the road surface, causing the power unit to rotate greatly around the horizontal axis (principal axis of roll inertia). Roll tries to move. Therefore, the mounting device is required to have a function of suppressing the above-mentioned large-scale behavior in addition to a function of insulating engine vibration under normal conditions. Various types of mounting devices having the function of suppressing such large movements have been proposed in the past, and for example, the following anti-vibration rubber device is disclosed in Japanese Utility Model Application Publication No. 59-1) 6647. . That is, the vibration isolating rubber device includes two frames fixed to the vehicle body side and the engine side, respectively, and an annular wall element made of a rubber-like elastic body connecting the two frames. It is provided. The effective passage cross-sectional area of the throttle passage provided between the chamber space of the annular wall element and the chamber space of one frame body is controlled by a needle member driven by an actuator, so that each of the chamber spaces is controlled by a needle member driven by an actuator. By adjusting the spring constant of the enclosed fluid damper, large movements of the power unit are suppressed. However, in a fluid-filled engine mount device such as the one disclosed in the above publication, if the fluid sealed in the mount device leaks, not only will the mount device not be able to sufficiently exert its suppressing function against large movements. The problem was that even the original vibration isolation function was impaired. In particular, in the case of the mounting device disclosed in the above publication, there is a high possibility that fluid will leak from the joint between the frame and the annular wall element. The present invention was devised under the above-mentioned circumstances, and has a vibration isolation function that absorbs engine vibrations during low loads such as idling, and a large behavior that suppresses the large behavior of the power unit when necessary. It is an object of the present invention to provide a large-scale behavior suppression device for a power unit that is equipped with a suppression function and is configured to maintain each of the above functions constant over a long period of time.

[Means to solve the problem]

In order to solve the above problem, the present invention takes the following technical measures. That is, the large behavior suppressing device for a power unit of the present invention includes an outer cylinder having a built-in solenoid, an inner rod that is inserted through and supported by the outer cylinder so as to be movable in the axial direction, and has a ferromagnetic part, Of the tube and inner rod,
The present invention includes a connecting member, one of which is connected to the power unit and the other to the vehicle body, and an energizing means for applying current to the solenoid under certain conditions. In addition, the above-mentioned certain conditions include, for example, when it is detected that the accelerator depression speed has exceeded a certain value, when sudden deceleration due to engine braking is detected, or when an external force above a certain value is applied to the power unit. When such a factor occurs, the operation of the energizing means is controlled and the solenoid is activated for a certain period of time or the cause of the power unit is activated. An open current is caused to flow.

[Action and effect]

Of the inner rod and outer cylinder that make up the connecting member, one is connected to the power unit and the other to the vehicle body, but since they are configured to be able to move relative to each other in the axial direction, they cannot be used in normal conditions. In this case, engine vibrations are absorbed by the axial movement of the inner rod relative to the outer cylinder or the axial movement of the outer cylinder relative to the inner rod. Therefore, engine vibrations are not transmitted to the vehicle body, and a vibration isolation function is achieved. On the other hand, if a factor that causes the power unit to behave violently occurs, this will be detected in advance and the current will be applied to the solenoid built into the outer cylinder for a certain period of time or until the above factor is resolved. be swept away. As a result, when the inner rod and the outer cylinder try to move relative to each other in the axial direction, a blocking force against the axial movement acts between the magnetic field generated in the solenoid and the ferromagnetic material of the inner rod. Relative movement of the rod or outer cylinder in the axial direction is suppressed. In other words, even if the power unit tries to make a large movement, the axial movement of the inner rod or outer cylinder connected to it is suppressed, which prevents the power unit from making a large movement and avoids a collision between the power unit and the vehicle body. . Moreover, in this case, a blocking force is generated between the magnetic field inside the solenoid and the ferromagnetic material, which is proportional to the axial co-movement speed of the inner rod or outer cylinder, that is, the behavior speed of the power unit, so the behavior of the power unit is greatly affected. If so, a correspondingly large behavior suppression effect can be obtained. In this way, the device for suppressing large behavior of a power unit of the present invention is configured to have an insulating function against vibrations of the power unit during normal times, while being able to reliably suppress large behavior of the power unit when necessary. Therefore, the device of the present invention is installed between the power unit and the vehicle body.
When installed, the elastic bodies installed in other mounting devices can be made sufficiently soft, resulting in the additional effect of increasing the vibration isolation function of the mounting device as a whole. You can expect it. Furthermore, unlike the fluid-filled mounting device, the present invention does not utilize a fluid damper, so there is no inconvenience such as the function of the mounting device being degraded due to fluid leakage, and the above-mentioned vibration isolation function and large The behavior suppression function is always maintained constant.

[Explanation of Examples]

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In this example, a case is shown in which the large behavior suppression device for a power unit of the present invention is installed in a horizontally placed FF type power unit 1. The large behavior suppressing device for a power unit of this example includes an outer cylinder 4 having a built-in solenoid 5, and an inner rod 6 which is inserted through and supported by the outer cylinder 4 so as to be movable in the axial direction and has a ferromagnetic part 7. In this example, as shown in FIG. 2, the connecting member 3 is connected to the front end of the power unit 1 in the longitudinal direction. The connecting member 3 is disposed at two locations, at a lower portion and an upper portion of the rear end, such that the axis of the connecting member 3 intersects the main axis of roll inertia of the power unit I substantially perpendicularly in plan view. In addition, at the bottom of the engine of power unit 1, similar to the general mount structure,
An appropriate number of mounting devices (not shown) are provided, and the power unit 1 is supported by the vehicle body 2 via these mounting devices. As shown in FIG. 1, the outer cylinder 4 houses the solenoid 5 in an annular space 9a of its cylinder part 9, and a connecting rod part 10 is formed extending from the cylinder part 9. ing. The inner cylindrical member 13 inserted into the cylindrical member 1) fixed to the end of the connecting rod part 10 via the elastic body 12 is rotatable on the support shaft 2b supported by the vehicle body side bracket 2a. By supporting the outer tube 4 on the vehicle body 2,
is connected to. On the other hand, the inner rod 6 is provided with the above-mentioned ferromagnetic part 7 by attaching a substantially cylindrical ferromagnetic material to the tip end thereof, and the ferromagnetic part 7 is provided on both sides of the ferromagnetic part 7. It is inserted and supported in the cylindrical portion 9 of the outer cylinder 4 through a pair of mounted bearings 14, 14 so as to be slidable in the axial direction. Then, like the outer cylinder 4, the cylinder member 15 fixed to the base end of the inner rod 6 is attached to the elastic body 16 and the inner cylinder member 17 on the support shaft 1b which is pivotally supported by the power unit side placket la.
The inner rod 6 is connected to the power unit 1 by being rotatably supported via the inner rod 6 . In the figure, a reference numeral 6a indicates that in the event that the energizing means 8 does not operate due to a malfunction of the device, the energizing means 8 comes into contact with the end of the outer cylinder 4 and the inner rod 6 moves beyond a certain distance with respect to the outer cylinder 4. This is a stopper portion for preventing the axial movement of the In this example, the outer cylinder 4 and the inner loft 6 are
is connected to the vehicle body 2 side and the power unit 1 side with a pin with a horizontal axis, respectively, so that the vertical swing of the power unit 1 is reduced by the above-mentioned support shaft 1 of the inner rod 6.
b and the rotation of the outer cylinder 4 about the support shaft 2b to prevent the vibration from being transmitted to the vehicle body 2. In addition, each of the above-mentioned cylindrical members 1). 1
5 and each inner cylinder member 13. The elastic bodies 12 and 16 interposed between the connecting member 3 and the IT enhance the buffering function of the connecting member 3 against vibrations of the power unit 2. On the other hand, energizing means 8 for passing current through the solenoid 5
As shown in FIG. 2, the circuit is closed by the operation of the relay 20, and the solenoid drive circuit 18, in which the battery 19 is electrically connected to each solenoid 5.5 of each connecting member 3.3, and the accelerator 0, which has an accelerator interlocking switch 21 that is closed when the amount of depression reaches a certain amount or more, and an accelerator interlocking circuit 22 that operates the relay 20 when the accelerator interlocking switch 21 is closed. In the example, when the accelerator pedal depression amount exceeds a certain level, that is, when the engine speed increases in a high rotation range, the energization means 8 operates the accelerator interlock switch 21 and causes the accelerator interlock circuit 22 to operate.
and closes the solenoid drive circuit 18, and each solenoid 5
, 5 so that current flows through them. In the above configuration, the inner rod 6.6 of each connecting member 3.3 is normally supported movably in the axial direction with respect to the outer cylinders 4, 4, so that the power unit 1 is The vibration in the longitudinal direction is absorbed by the sliding movement of the inner rod 6 in the axial direction with respect to the outer cylinder 4. Furthermore, as described above, vibrations in the vertical direction of the power unit 1 are effectively absorbed by the rotation of the inner rod 6 and the outer cylinder 4 about the support shafts 1b and 2b, and by the elastic bodies 12 and 16. Ru. Therefore, these vibrations are not transmitted to the vehicle body 2, and the vibration isolation function is reliably exhibited. Further, when the engine speed further increases from the predetermined speed, the accelerator interlock switch 21 is closed and the relay 20 is activated. This closes the solenoid drive circuit for one day, and current continues to flow through the solenoid 5.5 of each connecting member 3.3 until the increased engine speed is resolved. Therefore, for example, when the engine speed increases in a high rotation range, a large load is applied to the power unit 1, so the power unit 1 is rotated around the main axis of roll inertia.
In the figure, the ferromagnetic portion 7.7 of the inner rod 6.6 receives a blocking force against the axial movement due to the magnetic field generated in the solenoid 5.5. The axial movement of the inner rod 6.6 is suppressed, and large movements of the power unit 1 are prevented. Note that the scope of the present invention is not limited to the embodiments described above. For example, in the above embodiment, the inner rod is connected to the power unit side and the outer tube is connected to the vehicle body side, but this may be reversed, and the structure of the inner rod and outer tube can be modified in various ways. Of course. In addition, a control means for controlling the operation of the energizing means is provided, and this control means is activated by various sensors such as an acceleration sensor when a factor that causes the power unit to behave greatly, such as during sudden acceleration or sudden deceleration, occurs. The solenoid may be configured to receive the signal and cause the current to flow through the solenoid.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a connecting member according to an embodiment of the present invention, and FIG.
The figure is a diagram schematically showing the overall configuration of a large behavior suppression device for a power unit according to an embodiment. DESCRIPTION OF SYMBOLS 1... Power unit, 2... Vehicle body, 3... Connecting member, 4... Outer tube, 5... Solenoid, 6...
- Inner rod, 7... ferromagnetic body part, 8... energizing means.

Claims (1)

[Claims] (1) An outer cylinder having a built-in solenoid, and an inner rod that is inserted through and supported by the outer cylinder so as to be movable in the axial direction and has a ferromagnetic part, and one of the outer cylinder and the inner rod is a power unit. A device for suppressing large behavior of a power unit, comprising: a connecting member connected to one side and a connecting member connected to a vehicle body side; and an energizing means for applying current to the solenoid under certain conditions.